Would you send a picture of the spider attached? There is a possibly some one on this site who is a scope builder might being able to help. As others above had said, I would not send my hard earned money to Protostar if you do, kiss it good by.
I just got on this forum today and can't quite figure out how to attach an image yet. Sorry...
However, my spider is exactly as defined by Gary Seronek in his S&T article. See http://garyseronik.c...-mirror-holder/ In fact, I used that exploded parts view when I built it.
The trouble seems to be at the point where the spider hub attaches to the vane. My guess is that because it's attached towards the rear of the hub, most of the weight, including the secondary mirror, is too far down the hub, making it unbalanced and very susceptible to my touching the tube or even wind.
I can see how it might be stabilized by adding a second vane on the opposite side and closer to the mirror, effectively turning it into a 4 vane spider, at which point, after dismantling, redoing, and re-attaching the spider, I might as well buy a commercial one. Any ideas how I could stabilized without completely re-doing it (in which case I might as well just buy a commercial spider).
Thanks for the ideas.